Merge branch...

Merge branch '391922-feature-flag-rollout-of-rate_limit_for_unauthenticated_projects_api_access-remove' into 'master'

Remove FF `rate_limit_for_unauthenticated_projects_api_access`

See merge request https://gitlab.com/gitlab-org/gitlab/-/merge_requests/120445



Merged-by: Imre Farkas <ifarkas@gitlab.com>
Approved-by: Lorena Ciutacu <lciutacu@gitlab.com>
Approved-by: Imre Farkas <ifarkas@gitlab.com>
Reviewed-by: Manoj M J <mmj@gitlab.com>
Co-authored-by: Manoj M J <mmj@gitlab.com>